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Full text of "Design of the steel skeleton for an office building"

Iiliuu>;< institute 

o< rechnology 

UNIVERSITY LIBRARIES 



AT 249 

Collins, C. W. 

Design of the steel skeleton 
for an office building 



Jl%$im IN SL.ftL/kirlit 1 



;i, ; i 



■ - ■ :. •« 'j . 



THESIS 



THE DESIGN OF THE STEEL SKELETON 
FOR AN 
OFFICE BUILDING 

Presented By 




to the 
PRESIDENT AND FACULTY 
of the 
ARLIOUR INSTITUTE OF TECHNOLOGY 
for the degree of 
BACHELOR OF SCIENCE IN CIVIL ENGINEERING 
having completed the prescribed course of study- 
in 
CIVIL ENGINEERING 
1912 



ILLINOIS INSTITUTE OF TECHNOLOGY 
PAUL V.GALVtN LIBRARY 
35 WEST 33RD STREET 
CHICAGO, IL 60616 







c<£ 



Jtuoirf &£/ ' -&i^c6u^ 






IND3X. 

Art. Subject. Page. 

1. Introduction 1. 

2. Discussion 1-3 

3. Plate I -Design of Floor and Stringer 4 

4. Table 1-R ana la R 5-6 

5. Plate II-Design of Roof Beam and Girder 7 

6. Table 2-R to 6-R 8-12 

7. Plate Ill-Design of Floor 3eam 13 

8. Table IF to 3F 14-17 

9. Plate IV- Design of Floor Girder 18 

10. Table 4F to 7F 19-22 

11. Plate V and Va-Design of Exterior 

Columns 23-24 

12. Table - Tc 25 

13. Plate VI-Design of Interior Coliimns 26 

14. Table Zc 27 

15. Plate VII-Design of Column Base 28 

16. Table IB - laB 29-30 

17. Plate VIII-Framing Plans 31 

18. Plate IX - Typical Details 32 



33485 



1. 



THE DESIGN OF THE STEEL SKELETON FOR AN 
OFFICE BUILDING. 

The concentration of commercial interests with- 
in limited areas in large cities has been found to 
he advantageous both as to time and convenience , and 
has caused the introduction and adoption of the steel 
skeleton or cage building. To Mr. W. L. B. Jenney, 
a prominent Chicago architect and architect for the 
Home Insurance Building in 1883, belongs the credit 
for the conception of skeleton construction. By a 
bold and progressive departure from previous prac- 
tice, he introduced methods of construction which 
were soon generally adopted. 

After the plans of a building have been compiled 
by an architect, it is an engineer's problem to de- 
sign the steel work. The latter is what has been 
done in this thesis. A building of indefinite height 
could have been designed, but it was thought a ten- 
story building would involve the same problems as a 
twenty-story one, i.e., as it was only a question 
of time, it was determined to limit the height to 
ten stories. 



'd. 



The northwest corner of Monroe and Clark 
Streets, Chicago, was selected as a desirable site 
for the building under consideration. To space 
columns correctly and for the layout of offices, 
corridors, stairways, and elevators, an architect's 
plan for a building is necessary, but it was almost 
impossible to obtain a plan. Finally a small text- 
book plan of the New York Life Insurance Building, 
located at the northeast corner of LaSalle and 
Monroe Streets, Chicago, was obtained. After chang- 
ing a few minor dimensions, it was possible to ad- 
just the plan to the site selected. 

The lot is 80*-0" x 140' -0", and the light 
court in the rear of the building is 27' ~S M x 55 '-1 5/8" 
The height of the main floor is 15'-0 M , while the 
remaining floors, including the basement, are 
12'-0 n high, thus making the total height 135*-0". 
The ceiling of the tenth floor is suspended by hang- 
ers from the roof, which at its lowest point is 
about three feet above the ceiling. 

As specifications, the December, 1911 issue of 
the u Revised Building Ordinances of the City of 



3. 



Chicago" was followed throughout. Freitag's 
"Architectural Engineering," Kidder's "Architect's 
Handbook," and the Handbooks of the Cambria stnd 
Carnegie Steel Companies were found to be of valu- 
able assistance in the design. Much information 
was also obtained from the drawings furnished by 
Ft. C. and E. C. Shankland and Ritter and Mott , both 
prominent Chicago engineering firms. 

The design naturally divided itself into 

(1) Roof design (including joists or string- 
ers, beams, and girders). 

(2) Floor design. 

(3) Column design (Exterior and Interior). 

(4) Column bases and foundation design. 



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